الفهرس 
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Abstract
Twelve completely edentulous patients were selected from out clinic of Ain Shams University. All patients were systematically free. Medical and dental history for all patients was recorded. Extra oral examination was carried out to detect any facial disfigurement. TMJ was examined for any clicking, criptus, or shift in movement. Intra oral examination was carried out to detect any signs of inflammation, swelling, or flappy tissue. Radiographic examination to detect any bony pathosis.
Conventional complete denture was constructed for all patients. Lower denture was duplicated in a clear acrylic stent to be used as radiograghic stent and surgical stent after that. Panoramic radiograph was taken for all patients to detect the position of mental foramen using the radiographic stent with two metal spheres placed inside.
Four holes were made in a surgical stent corresponding to the further position of the four dental implants. The surgical stent was placed in patient mouth and the position of each mini implant was marked using suitable marker. Tissue punch was used to cut out the mucosa at the position of the mini implant marked previously. 1.1 mm drill was used to penetrate the bone to about one half of the threaded portion of the mini implant, mini implant was placed in the drilled site using its cap, then thumb wrench was used for more insertion force, finally torque wrench was used to finish the procedure. Suitable antibiotic and analgesic was prescribed to control any post-operative pain or infection.
Later on, patients were recalled to modify their lower denture to fit over the mini implants. The patients were divided equally into two group. group A patients, their lower denture was relined with ”Retention Sil”. group B, their lower denture was relined with ”Silicone based soft liner”. Panoramic radiograph was taken for each patient at time of insertion, at 6 months and at one year follow up intervals.
Mean value of bone height change around the mini implants was recorded every follow up appointment. The data was statistically analyzed using SPSS V17 (Statistical Package for Scientific Studies) for Windows.
Statistical analysis showed insignificant difference between the two groups in the bone height change around the mini implants.